The word `yamato kotoba` itself is composed of native Japanese words, and hence is an autological word. The synonym wago is instead a kango, and hence a heterological word. == Lexical function == Yamato kotoba form a fundamental part of the Japanese lexicon, similar to native words (from Old English) in English – while borrowed words are used .....Found on http://en.wikipedia.org/wiki/Yamato_kotoba